gcc/collect2-aix.h

   1 /* AIX cross support for collect2.
   2    Copyright (C) 2009-2013 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify it under
   7 the terms of the GNU General Public License as published by the Free
   8 Software Foundation; either version 3, or (at your option) any later
   9 version.
  10
  11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14 for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING3.  If not see
  18 <http://www.gnu.org/licenses/>.  */
  19
  20 /* collect2-aix.c requires mmap support.  It should otherwise be
  21    fairly portable.  */
  22 #if defined(CROSS_DIRECTORY_STRUCTURE) \
  23     && defined(TARGET_AIX_VERSION) \
  24     && HAVE_MMAP
  25
  26 #define CROSS_AIX_SUPPORT 1
  27
  28 /* -------------------------------------------------------------------------
  29    Definitions adapted from bfd.  (Fairly heavily adapted in some cases.)
  30    ------------------------------------------------------------------------- */
  31
  32 /* Compatibility types for bfd.  */
  33 typedef unsigned HOST_WIDE_INT bfd_vma;
  34
  35 /* The size of an archive's fl_magic field.  */
  36 #define FL_MAGIC_SIZE 8
  37
  38 /* The expected contents of fl_magic for big archives.  */
  39 #define FL_MAGIC_BIG_AR "<bigaf>\012"
  40
  41 /* The size of each offset string in the header of a big archive.  */
  42 #define AR_BIG_OFFSET_SIZE 20
  43
  44 /* The format of the file header in a "big" XCOFF archive.  */
  45 struct external_big_ar_filehdr
  46 {
  47   /* Magic string.  */
  48   char fl_magic[FL_MAGIC_SIZE];
  49
  50   /* Offset of the member table (decimal ASCII string).  */
  51   char fl_memoff[AR_BIG_OFFSET_SIZE];
  52
  53   /* Offset of the global symbol table for 32-bit objects (decimal ASCII
  54      string).  */
  55   char fl_symoff[AR_BIG_OFFSET_SIZE];
  56
  57   /* Offset of the global symbol table for 64-bit objects (decimal ASCII
  58      string).  */
  59   char fl_symoff64[AR_BIG_OFFSET_SIZE];
  60
  61   /* Offset of the first member in the archive (decimal ASCII string).  */
  62   char fl_firstmemoff[AR_BIG_OFFSET_SIZE];
  63
  64   /* Offset of the last member in the archive (decimal ASCII string).  */
  65   char fl_lastmemoff[AR_BIG_OFFSET_SIZE];
  66
  67   /* Offset of the first member on the free list (decimal ASCII
  68      string).  */
  69   char fl_freeoff[AR_BIG_OFFSET_SIZE];
  70 };
  71
  72 /* Each archive name is followed by this many bytes of magic string.  */
  73 #define SXCOFFARFMAG 2
  74
  75 /* The format of a member header in a "big" XCOFF archive.  */
  76 struct external_big_ar_member
  77 {
  78   /* File size not including the header (decimal ASCII string).  */
  79   char ar_size[AR_BIG_OFFSET_SIZE];
  80
  81   /* File offset of next archive member (decimal ASCII string).  */
  82   char ar_nextoff[AR_BIG_OFFSET_SIZE];
  83
  84   /* File offset of previous archive member (decimal ASCII string).  */
  85   char ar_prevoff[AR_BIG_OFFSET_SIZE];
  86
  87   /* File mtime (decimal ASCII string).  */
  88   char ar_date[12];
  89
  90   /* File UID (decimal ASCII string).  */
  91   char ar_uid[12];
  92
  93   /* File GID (decimal ASCII string).  */
  94   char ar_gid[12];
  95
  96   /* File mode (octal ASCII string).  */
  97   char ar_mode[12];
  98
  99   /* Length of file name (decimal ASCII string).  */
 100   char ar_namlen[4];
 101
 102   /* This structure is followed by the file name.  The length of the
 103      name is given in the namlen field.  If the length of the name is
 104      odd, the name is followed by a null byte.  The name and optional
 105      null byte are followed by XCOFFARFMAG, which is not included in
 106      namlen.  The contents of the archive member follow; the number of
 107      bytes is given in the size field.  */
 108 };
 109
 110 /* The known values of f_magic in an XCOFF file header.  */
 111 #define U802WRMAGIC 0730        /* Writeable text segments.  */
 112 #define U802ROMAGIC 0735        /* Readonly sharable text segments.  */
 113 #define U802TOCMAGIC 0737       /* Readonly text segments and TOC.  */
 114 #define U803XTOCMAGIC 0757      /* Aix 4.3 64-bit XCOFF.  */
 115 #define U64_TOCMAGIC 0767       /* AIX 5+ 64-bit XCOFF.  */
 116
 117 /* The number of bytes in an XCOFF file's f_magic field.  */
 118 #define F_MAGIC_SIZE 2
 119
 120 /* The format of a 32-bit XCOFF file header.  */
 121 struct external_filehdr_32
 122 {
 123   /* The magic number.  */
 124   char f_magic[F_MAGIC_SIZE];
 125
 126   /* The number of sections.  */
 127   char f_nscns[2];
 128
 129   /* Time & date stamp.  */
 130   char f_timdat[4];
 131
 132   /* The offset of the symbol table from the start of the file.  */
 133   char f_symptr[4];
 134
 135   /* The number of entries in the symbol table.  */
 136   char f_nsyms[4];
 137
 138   /* The size of the auxiliary header.  */
 139   char f_opthdr[2];
 140
 141   /* Flags.  */
 142   char f_flags[2];
 143 };
 144
 145 /* The format of a 64-bit XCOFF file header.  */
 146 struct external_filehdr_64
 147 {
 148   /* The magic number.  */
 149   char f_magic[F_MAGIC_SIZE];
 150
 151   /* The number of sections.  */
 152   char f_nscns[2];
 153
 154   /* Time & date stamp.  */
 155   char f_timdat[4];
 156
 157   /* The offset of the symbol table from the start of the file.  */
 158   char f_symptr[8];
 159
 160   /* The size of the auxiliary header.  */
 161   char f_opthdr[2];
 162
 163   /* Flags.  */
 164   char f_flags[2];
 165
 166   /* The number of entries in the symbol table.  */
 167   char f_nsyms[4];
 168 };
 169
 170 /* An internal representation of the XCOFF file header.  */
 171 struct internal_filehdr
 172 {
 173   unsigned short f_magic;
 174   unsigned short f_nscns;
 175   long f_timdat;
 176   bfd_vma f_symptr;
 177   long f_nsyms;
 178   unsigned short f_opthdr;
 179   unsigned short f_flags;
 180 };
 181
 182 /* Symbol classes have their names in the debug section if this flag
 183    is set.  */
 184 #define DBXMASK 0x80
 185
 186 /* The format of an XCOFF symbol-table entry.  */
 187 struct external_syment
 188 {
 189   union {
 190     struct {
 191       union {
 192         /* The name of the symbol.  There is an implicit null character
 193            after the end of the array.  */
 194         char n_name[8];
 195         struct {
 196           /* If n_zeroes is zero, n_offset is the offset the name from
 197              the start of the string table.  */
 198           char n_zeroes[4];
 199           char n_offset[4];
 200         } u;
 201       } u;
 202
 203       /* The symbol's value.  */
 204       char n_value[4];
 205     } xcoff32;
 206     struct {
 207       /* The symbol's value.  */
 208       char n_value[8];
 209
 210       /* The offset of the symbol from the start of the string table.  */
 211       char n_offset[4];
 212     } xcoff64;
 213   } u;
 214
 215   /* The number of the section to which this symbol belongs.  */
 216   char n_scnum[2];
 217
 218   /* The type of symbol.  (It can be interpreted as an n_lang
 219      and an n_cpu byte, but we don't care about that here.)  */
 220   char n_type[2];
 221
 222   /* The class of symbol (a C_* value).  */
 223   char n_sclass[1];
 224
 225   /* The number of auxiliary symbols attached to this entry.  */
 226   char n_numaux[1];
 227 };
 228
 229 /* Definitions required by collect2.  */
 230 #define C_EXT 2
 231
 232 #define F_SHROBJ    0x2000
 233 #define F_LOADONLY  0x4000
 234
 235 #define N_UNDEF ((short) 0)
 236 #define N_TMASK 060
 237 #define N_BTSHFT 4
 238
 239 #define DT_NON 0
 240 #define DT_FCN 2
 241
 242 /* -------------------------------------------------------------------------
 243    Local code.
 244    ------------------------------------------------------------------------- */
 245
 246 /* An internal representation of an XCOFF symbol-table entry,
 247    which is associated with the API-defined SYMENT type.  */
 248 struct internal_syment
 249 {
 250   char n_name[9];
 251   unsigned int n_zeroes;
 252   bfd_vma n_offset;
 253   bfd_vma n_value;
 254   short n_scnum;
 255   unsigned short n_flags;
 256   unsigned short n_type;
 257   unsigned char n_sclass;
 258   unsigned char n_numaux;
 259 };
 260 typedef struct internal_syment SYMENT;
 261
 262 /* The internal representation of the API-defined LDFILE type.  */
 263 struct internal_ldfile
 264 {
 265   /* The file handle for the associated file, or -1 if it hasn't been
 266      opened yet.  */
 267   int fd;
 268
 269   /* The start of the current XCOFF object, if one has been mapped
 270      into memory.  Null otherwise.  */
 271   char *object;
 272
 273   /* The offset of OBJECT from the start of the containing page.  */
 274   size_t page_offset;
 275
 276   /* The size of the file pointed to by OBJECT.  Valid iff OFFSET
 277      is nonnull.  */
 278   size_t object_size;
 279
 280   /* The offset of the next member in an archive after OBJECT,
 281      or -1 if this isn't an archive.  Valid iff OFFSET is nonnull.  */
 282   off_t next_member;
 283
 284   /* The parsed version of the XCOFF file header.  */
 285   struct internal_filehdr filehdr;
 286 };
 287 typedef struct internal_ldfile LDFILE;
 288
 289 /* The API allows the file header to be directly accessed via this macro.  */
 290 #define HEADER(FILE) ((FILE)->filehdr)
 291
 292 /* API-defined return codes.  SUCCESS must be > 0 and FAILURE must be <= 0.  */
 293 #define SUCCESS 1
 294 #define FAILURE 0
 295
 296 /* API-defined functions.  */
 297 extern LDFILE *ldopen (char *, LDFILE *);
 298 extern char *ldgetname (LDFILE *, SYMENT *);
 299 extern int ldtbread (LDFILE *, long, SYMENT *);
 300 extern int ldclose (LDFILE *);
 301
 302 #endif